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TRF7970A
www.ti.com
Table of Contents
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
1
Device Overview ......................................... 1
6.8
Transmitter – Digital Section ........................ 27
2
3
4
5
6
1.1 Features .............................................. 1
1.2 Applications ........................................... 1
1.3 Description ............................................ 1
1.4 Functional Block Diagram ............................ 2
Revision History ......................................... 4
Device Characteristics .................................. 5
Terminal Configuration and Functions .............. 5
4.1 Pin Assignments ...................................... 5
4.2 Terminal Functions ................................... 6
Specifications ............................................ 8
5.1 Absolute Maximum Ratings .......................... 8
5.2 Recommended Operating Conditions ................ 8
5.3 Electrical Characteristics ............................. 9
5.4 Handling Ratings .................................... 10
5.5 Thermal Characteristics ............................. 10
5.6 Switching Characteristics ........................... 10
Detailed Description ................................... 11
6.1 Overview ............................................ 11
6.2 System Block Diagram .............................. 14
6.3 Power Supplies ...................................... 14
6.4 Receiver – Analog Section .......................... 20
6.5 Receiver – Digital Section ........................... 21
6.6 Oscillator Section ................................... 26
6.7 Transmitter – Analog Section ....................... 27
7
8
9
6.9 Transmitter – External Power Amplifier and
Subcarrier Detector ................................. 28
6.10 TRF7970A IC Communication Interface ............ 29
6.11 Special Direct Mode for Improved MIFARE?
Compatibility ......................................... 47
6.12 NFC Modes .......................................... 47
6.13 Direct Commands from MCU to Reader ............ 50
6.14 Register Description ................................. 54
Application Schematic and Layout
Considerations .......................................... 74
7.1 TRF7970A Reader System Using Parallel
Microcontroller Interface ............................. 74
7.2 TRF7970A Reader System Using SPI With SS
Mode ................................................ 75
7.3 Layout Considerations .............................. 76
7.4 Impedance Matching TX_Out (Pin 5) to 50 ? ...... 76
7.5 Reader Antenna Design Guidelines ................ 78
Device and Documentation Support ............... 79
8.1 Documentation Support ............................. 79
8.2 Community Resources .............................. 79
8.3 Trademarks .......................................... 79
8.4 Electrostatic Discharge Caution ..................... 79
8.5 Glossary ............................................. 79
Mechanical Packaging and Orderable
Information .............................................. 79
9.1 Packaging Information .............................. 79
Copyright ? 2011–2014, Texas Instruments Incorporated
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Table of Contents
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